Saw filing machine



June 1.7, 1941. Y F, 1 KNOWLES 2,245,984

SAW FILING MACHINE Filed July 24, 1959 2 Sheets-Sheet 1 June-17, 1941.F. J, KNowLEs 2,245,984

SAW FILING MACHINE Filed July 24, 1939 2 Sheets-Sheet 2 Patented June17, 1941-1.A

ortica SAW FILING MACHINE Application July Z4, 1939, Serial No. 286,268

(Cl. 'Z6-35) 5 Claims.

This invention relates to saw lilling machines and its object is toprovide certain detailed improvements in machines ofthatkind which willproduce a strong and rigid structure to thereby obviate any vibration orchattering as the file engages the saw and which will make the operationof such machines smoother and more accurate.

The invention is illustrated in the accompanying drawings forming a parthereof and in which Figure 1 is a side elevation of the machine;

Figure 2l is a front elevation thereof;

Figure 3 is a vertical section on the line 3-3 of Figure 1;

Figure 4 is a vertical section on the line 4--4 of Figure 1;

Figure 5 is a detailed View of the cam and associated parts forproducing vertical movement of the bed plate, as later described, thisview being taken on line 5--5 of Figure 4; and

Figures 6 and 7 are detailed views of the sawfeeding pawls andassociated parts, Figure 7 being a section on the line l-l of Figure 6.

Referring to the drawings in detail, the machine comprises a stationaryframe or support I formed with a bearing II in which a main drive shaftI2 is supported, and which may be rotated in any manner desired, as bymeans of a motor M which drives a belt wheel I3 to rotate the gear wheelI4 secured t0 said shaft. Rigidly mounted in the frame Il) are two guidebars which are slightly inclined from the vertical, as later explained.Slidably mounted on each bar I is a bearing block I6, and coiled springsIl surrounding the bars I5 tend to force said blocks downwardly. Securedto the bearing blocks I6 'is a bed plate I8, provided with an opening I9through which the shaft I2 extends. A cam 20 is arranged in thev openingI9 and secured to the shaft I2, a follower plate 2l on the bed plate I8being arranged to bear on said cam. Rotation of the shaftv I2 will thusproduce vertical or substantially vertical reciprocation of the bedplate I8.

The motor M is conveniently mounted on a platform P supported on theupper ends of the bars I5 and on standards 22 secured in the frame ofthe machine.

The bed plate I8 at its upper edge carries two horizontally arrangedbearing blocks 23 rigidly secured thereto in any suitable manner.Slidably mounted in the bearing blocks 23 is a supporting rod 24.Mounted on and supported by this rod is a le carrier plate 25, which isprovided on its upper edge with ears 25A vertically slotted at 23.Clamping bolts 25B extend through these slots and are threaded into thesupporting rod 24. The ears 25A extend transversely above the rod 24,and set screws 25C are threaded downwardly through such extensions toengage the top surface of the supporting rod 24. By means of the slots26 vertical adjustment of the carrier plate 25 may be made, and thebolts 25B serve to hold this plate in any desired position ofadjustment. The set screws 25C serve to accurately fix the position towhich the plate is adjusted. By the vertical adjustment of the carrierplate 25 the position of the le F relative to the Work may be readilyand accurately fixed, and the machine may thus be readily adapted forles of different sizes.

Adjacent the end of the shaft I2, the carrier plate 25 is provided witha vertical bearing slot 2l. A crank plate 28 is secured to the end ofthe shaft I2 and this plate carries a roller 29 which is adapted tooperate in the slot 2l. It will thus be seen that rotation of the shaftI2 will cause horizontal reciprocation of the carrier 25 and the le Fmounted therein and also the supporting rod 24 to which the plate issecured. A guide bar 33 extends downwardly from the carrier plate 25 andengages in a slotted guide member 3| secured to lugs I8A on the loweredge of the base plate I8. By this means the plate 25 is accuratelyguided during the movements thereof.

To support the le F on the carrier plate 25, the latter is provided onone side along its lower horizontal edge with a triangular rib 33, asshown particularly invFigure 3. Mounted on this rib are clamping plates35, each having a triangular clamping f ace adapted to t the rib 33.Cooperating clamping plates 35 are arranged to engage the other side ofthe carrier plate 25, and the plates 33 and 33 are drawn together bybolts 36. Each of the plates 35 is preferably provided with a pin 35Afor engaging a recess in the corresponding plate 34. At their lower endsthe plates 31E are slotted and recessed to receive file holders such asshown inmy copending application Serial No. 231,991, and in which theymay be clamped by bolts 33. By loosening the bolts 36, it is apparentthat one or both of the plates 34 with its cooperating plate 35 may beadjusted along the rib 33. Such adjustment of both plates 34 permits theuse of files of different lengths and it also enables the travel of thele to ybe centered relative to the work which results in longer life andmore uniform wear of the les. It will be noted further that the positionof the le F is such that the upward thrust on the carrier plate willcome between the bearing blocks 23 and Will have little or no tendencytoward tilting the outer end of said plate upwardly.

To support a saw S during the filing operation, a vise V, such as shownin my copending application Serial No. 243,635, is preferably employed.To feed the saw through the vise, a bell-crank lever is pivotallymounted at 4I on a fixed stud on the stationary frame IU of the machine.The upper arm of the lever 40 carries an adjustable tappet screw 42which is positioned to be engaged by a lug or projection I8B on thevertically moving bed plate I8. The lower end of the lever 40 hasconnected thereto a coiled spring 43 for drawing the same rearwardly,and an adjustable stop screw 44 limits such rearward movement. Two pawlsand 46 are pivotally mounted on the lower arm of the lever 40. One ofthese pawls is arranged to engage the teeth of the saw on one side ofthe file F and the other on the other side of the file. The pawl 45 ispivoted in the bifurcated lower end of the lever 4I) and the pawl 45 isbifurcated to engage over the end of the pawl 45 and the bifurcated endof the lever 40. A pivot pin 41 connects the pawls to the lever 40, andby this arrangement both pawls are mounted on the same pivotal center.The tappet screw 42 and stop screw 44 may be adjusted to secure properfeed of the saw and to accommodate saws with different sized teeth, andthe use of two pawls insures accurate and continuous feed of the saweven if one of the pawls fails for any reason to operate properly.

The operation of the machine will be clear without extended description.A saw S is inserted in the vise V and the feed pawls adjusted to giveproper feed for the saw in question. Rotation of the shaft I2' causesvertical reciprocation of the bed plate I8 by the cam 20, and horizontalreciprocation of t'he carrier plate 25 and the file F is produced by thecrank 28. Vertical movement of the bed plate I8 also operates the feedpawls 45 and 46 to move the saw step by step beneath the file. Thevarious parts, of course, operate in proper sequence. The le F isbrought into engagement with the saw S held in the vise and moves acrossthe same; it is then lifted and returned for another stroke during whichtime the feed pawls operate to advance the saw -another tooth.

Variations in structure may be resorted to within the scope of theinvention.

Having thus described the invention, what is claimed as new and desiredto be secured by Letters Patent is:

1. In a saw filing machine, in combination, a vertically reciprocatingbed plate, a plurality of horizontally spaced bearings carried by saidbed plate, a supporting rod slidably mounted in said bearings, a lecarrier plate secured to and supported at its upper edge on said rod,means for imparting vertical reciprocating motion to said bed plate andhorizontal reciprocating motion to said carrier plate and supportingrod, means for mounting a le on said carrier plate, and means foradjusting said carrier plate up or down relative to said supporting rodto thereby adjust the position of the carrier plate and the file.

2. In a saw filing machine, in combination, a stationary frame havingvertically arranged slightly inclined guide bars mounted therein, avertically reciprocating bed plate mounted on said bars, and havinghorizontallyspaced bearings thereon, a supporting rod slidably mountedin said bearings, a file carrier plate secured to and carried at itsupper edge by said rod cooperating means on said rod and carrier platefor adjusting said carrier plate up or down relative to said supportingrod, le supporting members adjustably mounted on the lower edge of saidcarrier plate, and means for reciprocating said bed plate and carrierplate and said supporting rod.

3. In a saw filing machine, in combination, a vertically reciprocatingbed plate, a horizontally reciprocating carrier plate supported on saidbed plate, means for imparting reciprocating motion to said bed plateand carrier plate, means for adjusting said carrier plate verticallyrelative to said bed plate, said carrier plate having a triangular ribextending horizontally along the lower edge thereof, two file supportingmembers adjustably mounted on said rib, and each comprising an angularclamping plate and a cooperating yplate arranged on opposite sides ofsaid carrier plate and bolted together, the angular clamping plate ofeach pair being shaped to t over and being adjustable along saidtriangular rib on the carrier plate, and le holders carried by saidangular clamping plates.

4. In a, saw ling machine, in combination, a stationary frame, a shaftrotatably supported thereon, two vertically arranged guide bars rigidlymounted in said frame, a vertically reciprocating base plate mounted onsaid guide bars, a cam on said shaft for reciprocating said base plate,said base plate having horizontally spaced bearings secured to the upperportion thereof, a supporting rod slidably mounted in said bearings, ale carrier plate secured to and supported at its upper edge by said rod,a crank arm carried by said shaft and engaging said carrier plate forreciprocating the same cooperating means on said rod and carrier platewhereby said carrier plate may be adjusted up or down relative to saidbearing rod, said means comprising ears on said carrier plate extendingabove said rod and set screws arranged in saidears and engaging said rodand file supporting members carried by said carrier plate and adjustablehorizontally thereon.

5. In a saw ling machine, a file carrier plate, a bearing rod to whichthe upper edge of said plate is secured, means for adjusting said plateup or down relative to said rod, Said carrier plate having a horizontaltriangular rib extending along the lower edge thereof, two triangularclamping plates adjustably mounted on said rib and spaced apart toreceive a file between the same, means for clamping said plates on saidrib, le carrying members supported by said clamping plates and means forhorizontally reciprocating said carrier plate and bearing rod.

FREDERICK J. KNOWLES.

